Folding carbonic acid concentration measuring instrument



FIG. 1 is a perspective view of a first embodiment of our new design;

FIG. 2 is a perspective top, front, and left-side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a Reference view showing a transparent part view thereof; and,

FIG. 10 is Reference perspective view of lid opening state thereof. 

CLAIM The ornamental design for a folding carbonic acid concentration measuring instrument, as shown and described. 